I am thinking about adding a Diatom filter to my 75gal discus setup, I am currently running an xp3 on it and i still get little floating particles throughout the tank. I do a 10 gal water change every other day and 20 gal on the weekend. I have tried stepping up the water changes and have had no effect. WOuld the Diatom Filter clear this up. I looking at the vortex XL. I would like to put it inline of the Renas return line is this possible will it mess up either filter doing this. Also I have seen that the Xl is meant to be run continously and on intervals up to a total of 8 hrs weekly. Which is true? your comments or suggestions would be appreciated.